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He wanted a burning laser to build. I suppose if he turns out to have absolutely no knowledge about the safety of working with these lasers, he should start at a lower power. It's difficult to gauge the age of new members here as there have been quite a few teens and younger joining. Got to admit, for the money, the M140 is about the biggest bang for your buck out there. It will most certainly burn paper, wood, skin, and of course eyes.

Using that logic....
I want to build a nuclear exploding device...

(Keep in mind I have no clue, information or
experience as to anything nuclear.)